My comment is about your Perl Module installation.
You can use local::lib and install Perl Module in your home directory. Write the appropriate code using GnuPlot module. Show it to your manager to ask the sys-admin to install that for you in the appropriate directory. Your problem can be more general to lot of people and there has to appropriate solution which gives more freedom to developers and hence better CPAN for all of us.

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Re^2: How to declare variables per loop
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Now the bad news. I installed Chart::Gnuplot and faced the same problems which were already described at Chart::Gnuplot and Windows XP. Since my script runs ok now - thanks to you guys - I am going to keep using / developing it at least by now.

Can you change your platform to linux?( GNU or Ubuntu)
It is easy to install for yourself. You can then put the output anywhere you like via mail/ftp/shared drive etc..
Solution can take extra time and effort but worthwhile in the long run.